How 2 use another ScriptManager in other page usngMasterPage

How to use another/multiple ScriptManager in other page using MasterPage which MasterPage has a ScriptManager?

Design Page (MasterPage.master):
here, I use a ScriptManager, Panel (black colored) and a button. And also use Ajax ModalPopupExtender1.

Source Code (MasterPage):

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<%@ Register Assembly ="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="pm" %>





   
   
   
   


   

   

       
           
               
               
               
               
           
           
               
               
               
               
           
           
               
               
               
               
           
       

	onclick="Button1_Click" />
	Name                                                                                                                                               Job

   

   

Code View(MasterPage):
public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        ModalPopupExtender1.Show();
    }
}

Design Part (Default3.aspx)
here I use a UpdatePanel. Does not use any extra ScriptManager.


Source View (Default3.aspx)

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" Title="Untitled Page" %>




   
   
       
       
       
       
       
   
   
       
       
       
       
   
   
       
       
       
       
       
   
   
       
       
       
       
       
   



Code View (Default3.aspx.cs)
public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button9_Click(object sender, EventArgs e)
    {
        Label1.Text = "Hello";
    }
}

Run (Show Error)


Then I add a ScriptManager on Default3.aspx page.

Design Part (Default3.aspx): Modified:


Then Again Run Default3.aspx:

Error:



This is the Problem...................

Please solve this problem whereas I use multiple ScriptManager in another page using MasterPage (where already use ScriptManager).